Fair Oak Farms is recalling approximately 1,134 lbs. of pork sausage patties due to possible listeria contamination, according to an alert issued by the Food & Drug Administration.

The fully-cooked frozen pork sausage patties were produced on Aug. 8, 2017. The products subject to the recall are 2 lbs. plastic sleeve packages containing "Breakfast Best Fully Cooked Original Pork Sausage Patties" with a sell-by date of 5/15/2018 and establishment number of EST. 174791.

Officials said a routine testing indicated positive results for listeria. While the affected products were placed on hold at a distribution center, they were accidentally shipped, officials said.

Listeria bacteria can cause listeriosis, a serious infection that can be fatal in older adults, persons with weakened immune systems, and pregnant women and their newborns. Symptoms include fever, muscle aches, headache, stiff neck, confusion, loss of balance and convulsions, as well as diarrhea or other gastrointestinal symptoms. In pregnant women, listeriosis can cause miscarriages, stillbirths, premature delivery, or life-threatening infection of the newborn.

Consumers who purchase products affected by the recall should not consume them. They should be thrown away or returned to the place of purchase.